1d4e04f7a7
On Wasm, it's not currently possibly to change which `personality` is attached to a given IR function. This is primarily because no matter what `personality` is attached, codegen creates a call to a `Unwind_CallPersonality` wrapper hard-coded to call c++abi's personality. In order to allow alternative personalities without introducing bloat at each personality call site, this PR adjusts the ABI of the personality on Wasm. `Unwind_CallPersonality` is moved to `libcxxabi` under the name `__gxx_wasm_personality_v0`, with the "real" personality code renamed `__gxx_personality_imp` and called by `__gxx_wasm_personality_v0` (after resetting the landing pad context). The signature of EH personalities on Wasm is now `int personality(void* exception_object)` (where the int return is `_Unwind_Reason_Code` and the `void*` is `_Unwind_Exception*`), and personalities are expected to `__wasm_lpad_context.selector = 0;`. Based on #175202
32 lines
1 KiB
LLVM
32 lines
1 KiB
LLVM
; RUN: opt -passes='simple-loop-unswitch<nontrivial>' < %s -S | FileCheck %s
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; CHECK: if.end{{.*}}:
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; CHECK-NOT: if.end{{.*}}:
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declare i32 @__gxx_wasm_personality_v0(ptr)
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declare void @foo()
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define void @test(i1 %arg) personality ptr @__gxx_wasm_personality_v0 {
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entry:
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br label %while.body
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while.body: ; preds = %cleanup, %entry
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br i1 %arg, label %if.end, label %if.then
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if.then: ; preds = %while.body
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br label %if.end
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if.end: ; preds = %if.then, %while.body
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invoke void @foo()
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to label %cleanup unwind label %catch.dispatch
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catch.dispatch: ; preds = %invoke.cont, %if.end
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%0 = catchswitch within none [label %catch] unwind to caller
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catch: ; preds = %catch.dispatch
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%1 = catchpad within %0 [ptr null]
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unreachable
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cleanup: ; preds = %invoke.cont
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br label %while.body
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}
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